Shielded electrical connector



April 22, 1952 R. E. PARISH, JR

SHIELDED ELECTRICAL CONNECTOR Filed Sept. 27, 1948 72' .7. Z6 Z7 Z0 /9 qll-z 7 Patented Apr. 22, 1952 UNITED STATES PATENT IOFFICE 2,594,004 SHIELDED ELECTRICAL CONNECTOR Robert E. Farish, Jr., Columbus, Ga. Application September 27, 1948, Serial No. 51,441

This invention relates to electricalv connectors.

An object of this invention is to provide an electrical connector embodying three terminals, the connector being adaptable to use inradios between the microphone and transmitter and including a shield so that the radio circuit will be completely shielded. x

Another object of this invention is to provide aconnector of this kind including means for detachably coupling the separable parts together, the coupling means also providing separable contacts for the shielded circuit.

To the foregoing objects. and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and arrangement of parts, as will .be more specifically referred to and illustrated in the accompanying drawings, but it is to be understood thatchanges, variations, and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawings:

Figure 1 is a longitudinal section of an electrical connector constructed according to an embodiment of this invention,

Figure 2 is a sectional view taken on the line 2 2 of Figure 1,

Figure 3 is a fragmentary sectional view takenA on the line 3-3 of Figure l,

Figure 4 is an end elevation of the annular contact ring carried by -one of the three connector parts.

Referring to the drawing, the numeral I designates generally an insulating body which may be enclosed in an outer jacket II. The vbody I0 at one end thereof has mounted thereon a cap I2 having an opening within which an insulating bushing I3 is adapted to be positioned. T he wires leading to the connector are adapted to be extended through the bushing |3 and to b e connected to one set of terminals as will be hereinafter described.

The body I0 is formed with a centrally disposed socket I4 within which a spring-pressed contact member I5 is positioned. The contact member I5 is secured to a shaft I6 which extends through a plate I1 xed by fastening means I8 to the inner end of the socket I4. The shaft I6 has fixed to its outer end a head I9 and a conductor is connected between the head I9 and a central terminal 2 I. A spring 22 engages about the shaft I6 bearing at its inner end against the contact member I5 and bearing at its outer end against the plate I1 so as to constantly urge the contact member |5 inwardly.

1v claim. (c1. 114-35) The body I0 has embedded therein adjacent the opposite end thereof a ring 23 which is formed of a plurality of bent connecting contact fingers 24 projecting into a counterbore 25 formed in the body IU. The ring 23 is connected by means of a conductor 26 to a second terminal 21 which is carried by the body l0 adjacent the terminal 2|. A detachable plug 23 of conical configuration engages in a conical seat 29 formed in the body Ill and the plug 23 has xed thereto a contact member 39 which is adapted to engage the spring-pressed contact member I5.

The contact member 3|] includes a shank 3| which is embedded in the apex of the plug 28 and the shank 3| is connected by means of a conductor 32 to a terminal 33 carried by the outer end of the plug 28. A contact ring 34 having a reduced and bevelled anchoring portion 35 which is embedded in the plug 28 is adapted to engage in the chamber or counterbore 25 and to frictionally engage the connected spring iingers 24. The ring 34 is connected by means of a conductor 36 to a terminal 31 disposed adjacent the terminal 33 and the terminals 33 and 31 are adapted to be connected to a pair of electrical conductors which are extended through an insulating bushing 38 carried by a cap 39 attached to the outer anged or base portion 40 of the plug 28.

The body l0 also has embedded therein a cylindrical shield member 4| which encircles the socket I 4 and is connected by means of a conductor 42 to a terminal 43. The terminal 43 is disposed adjacent the two terminals 2| and 21. The body I0 is formed with an annular' groove or channel 44 at the end thereof opposite from the terminals 2|, 21 and 43 and a contact ring 45 is fixed to the adjacent end of the body I0 and is electrically connected with the cylindrical shield member 4| thereby providing a complete shield for circuits with terminals 2I-33 and 21--50.

The annular contact member 45 is formed with at least a pair of keyhole slots 46 communicating with the channel 44 and a pair of headed locking members 41 carried by Shanks 48 which are embedded in the flange 40 of plug 28 are adapted to detachably engage in the slots 46 so as to removably secure the plug 28 to the end of the body I0.

At least one of the coupling or locking members 41 is connected by means of a conductor 49 to a third terminal 50 disposed within the cap 39.

With a connector as hereinbefore described, a radio microphone and transmitter may be connected together by a complete shielding means which includes the connector whereas heretofore the shielding means for the microphone and transmitter was broken at the connectors for the lines between the microphone and transmitter.

The above described shield is applicable to electrical devices such as small motors, hand power tools, refrigerators, drink boxes or thelike where a third wire connection on ground is desirable.

In the use and operation of this connector, the terminals 2 l, 21 and 43 are connected to a series of wires and the connectors 33, 31 and 50 are connected to another series of wires. 28 is inserted within the conical-socket or seat 28 so that the contact member 30 willengage the spring-pressed contact l5. At thisltime con tact ring 34 will engage the spring-contact iingers 24 and combined contact and locking members 41 will engage contact ring 45 and" at-the same time will detacnably secure the cap 39 and plug 28 to the bodyy I0.V

The connector herein disclosed will provide an explosion proof and dust-proof connector af fording a polarized Vplug Whichis adaptable to either A. C.A or D. C. current. The: third connection may be used as a safety ground for tools or appliances. This connector is lshock-proof and may be used as a convenience outlet for various appliances and will provide lpositive andv locked connections which'will prevent the yseparation of the connections while permittingthe easyv coupling or uncoupling of the connector parts.

What I claim is:

An electrical connector comprising an insulating body having a socket openingth'rough one end thereoffsaid body having a tapering plug seatfat the open end thereof and an annular channel between the ends of said seat, a springpressed contact in said socket'centrally thereof,`

The pluga ring embedded in said body, a terminal electrically connected to said ring, resilient contact fingers carried by said ring and disposed in said channel, a conical plug engaging said seat, a contact at the peak of said plug engaging said spring-pressed contact, a contact ring carried by said plug engageable with said lingers, a terminal electrically connected to said contact ring, a cylindrical shield embeddedlin said body and circumscribing said socket, a contact ring fixed to oneA end of said shield and formed with at least a pair of keyhole slots, at least a pair of combined plug locking and contact members carried by said plug and engageable in said slots for detachably securing said plug in said seat on alignment' thereof with said slots, a removable capenclosing the` outer end of said plug, and a second cap enclosing the other end of said body.

ROBERT E. FARISH, J R.

REFERVENCES CITED The following references-'are ofrecord Yin the le of this patent:

UNITED STATES PATENTS Number Name Date 1,370,093` Crouse et al Mar. 1.11921 1,484,992 Kijima Feb. 26,*1924 1,665,018 Black Apr.- 3, 1928 2,004,105 ,-Farish, Jr; June' 11; 1935 2,075,794 Allabach Apr. 6, 1937 2,110,133 Douglas Mar. 18, 1938 2,461,268 Goldeld Feb. 8', 1949 FOREIGN PATENTS Number Country Date 140,514 Switzerland Aug. 16, 1930 537,968A Great Britain July l5, 1941 

